Abstract
In the flat surface (point to plane) technique of spectrochemical analysis, some of the vapour released from the sample electrode during sparking is condensed on the graphite counter electrode. The counter electrode subsequently contributes to the radiation of the sample spectrum. The degree of contamination is dependent on the discharge-type and spark-gap parameters, but is in its turn responsible for effects with regard to the spectrum excitation which are characteristic of the method of flat surface sparking.
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